RU2733580C2 - Sliding coupling opening tool - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to development of oil and gas wells and stimulation of deposit, in particular to tool for opening of sliding coupling. Tool comprises engaging element, ball seat and guide head connected in series. Engaging element comprises at least two resilient latches uniformly arranged in a circular direction, and at least one engaging part disposed on elastic latch outer peripheral surface. Engaging element is additionally equipped with the first channel for fluid medium, which passes through the engaging element. Ball seat is equipped with the second channel for fluid medium passing through the ball socket. Inside the second channel of fluid medium there is a supporting surface for the sealing ball. Second channel of fluid medium communicates with the first channel of fluid medium. Guide head is equipped with the third channel of fluid medium passing through the guiding head and communicating with the second channel of fluid medium. Ledge or groove are located on outer peripheral surface of elastic latch.

EFFECT: technical result is improved efficiency of development of wells.

16 cl, 7 dwg

Description

Cross-reference to related claims

The present application claims priority based on Chinese patent applications: CN 201610036826.2, entitled “Sliding Sleeve Opening Device”, filed on January 20, 2016; CN 201610037242.7, entitled “Tool for Opening the Movable Seal Sliding Sleeve”, filed January 20, 2016; CN 201620056708.3, entitled "Ejection Tool for Opening the Sliding Clutch" filed on January 20, 2016; CN 201610037576.4 entitled "Sliding Sleeve Opener" filed January 20, 2016. The above applications are fully incorporated into this application by reference.

Technology area

The present disclosure relates to the technical field of oil and gas well development and reservoir stimulation, and in particular to a tool for opening a sliding sleeve.

State of the art

As an oil and gas reservoir evolves towards a tight, low permeability reservoir, the associated traditional instrumentation technology can no longer meet modern requirements. The slip collar is one of the key tools for communicating with the annular space between drill pipes and casing and achieving staggered failure during the fracturing process. During the test process for the development of oil and gas wells for gas production, the annular space between the drill pipes and the casing is communicated by the opening action of the sliding sleeve to enable operations such as circulation, fluid replacement, sand fracturing. Only one sliding sleeve is required for one-stage stimulation. However, multiple sliding sleeves need to be connected in series on the same drill string during multi-stage stimulation. During multi-stage stimulation, one stage is destroyed after the corresponding sliding clutch stage is opened, and multiple stages are destroyed from bottom to top. With the exploration and development of a tight gas reservoir, the horizontal segment of a horizontal well is getting longer and there are more and more sand fracturing stages. Technologies of ten, twenty or even tens of stages are required for sliding couplings.

The traditional sliding sleeve uses a ball as the pressure holding mechanism. One ball corresponds to one ball socket, and the diameter of the ball is larger than the diameter of the ball socket. When a multi-stage sliding sleeve is used for operations, the various balls and ball seats receiving the balls are arranged in such an order that their dimensions increase depending on the determined level difference in stages. During stimulation, the balls are thrown in order from small to large to open the corresponding sliding sleeves. In order to overcome the shortcomings of traditional sliding sleeve technologies, new sliding sleeve technologies where more stages can be achieved have been theoretically proposed domestically and abroad. For example, a composite sliding sleeve has been developed that has special suitable opening tools, and this composite sliding sleeve can be opened by automatic and one-way engagement between the opening tools and the sliding sleeve.

However, to date, after the composite sliding sleeve is opened with the opening tools and the stimulation of the fracture is completed, the opening tools can only be pulled out of the wellbore one by one, the efficiency of which is low. In addition, the opening tools do not have a pushing function, a pushing support function, a cleaning function and a sealing function, and the effect obtained by using these opening tools is not satisfactory.

Disclosure of the essence of the invention

The main objective of the present disclosure is to provide a sliding sleeve opening tool that can overcome the drawbacks in the prior art and have at least one of pushing function, catching function, pushing support function, plaque scraping function, and sealing function.

To achieve the above object, the present disclosure is a sliding sleeve opening tool that includes an engaging member, a ball socket, and a guide head connected in series.

The engaging element comprises at least two elastic latches evenly spaced in a circular direction and at least one engaging piece located on the outer peripheral surface of the elastic latch, and the engaging element is additionally provided with a first fluid channel that passes through the engaging element.

The ball seat is provided with a second fluid channel that passes through the ball seat, and inside the second fluid channel there is a section with a tapered opening for receiving a sealing ball, the second fluid channel communicating with the first fluid channel.

The guide head is provided with a third fluid channel that passes through the guide head and the third fluid channel communicates with the second fluid channel.

According to the sliding sleeve opening tool, the guide ramp is located on the outer peripheral surface of the end of the engaging member away from the ball seat.

According to the tool for opening the sleeve, a protrusion or groove is provided on the outer peripheral surface of the elastic catch.

According to the tool for opening the sliding sleeve, the guide ramp is located on the outer peripheral surface of the end of the guide head away from the ball seat.

According to the sliding sleeve opening tool, the third fluid channel includes a tapered bore section located at the end of the guide end, and the large open end of the tapered bore section is far from the ball seat.

According to the sliding sleeve opening tool, the inner diameter of the large hole of the end of the tapered hole section is smaller than the outer diameter of the guide head, and the end surface is formed between the outer peripheral surface of the guide head and the hole wall of the tapered hole section. The longitudinal section of the end surface along the axial direction of the tapered bore section has the shape of a circular arc.

In accordance with the sliding sleeve opening tool, an annular groove that extends circumferentially along the third fluid channel is located on the inner wall of the third fluid channel.

According to the tool for opening the sliding sleeve, the retaining portion is located on the inner wall of the first fluid channel near the ball seat. The second fluid channel further comprises a middle hole section that communicates with the hole with a taper section, and the middle hole section is provided with a support surface. The retaining part and the bearing surface together with the second fluid channel form a ball cage, and the sealing ball is located in the ball box.

According to the tool for opening the sliding sleeve, the ball socket has a connecting end portion that is connected to the engaging member, and an annular elastic member is disposed on the connecting end portion.

In accordance with the tool for opening the sliding sleeve, a press ring is additionally activated, which is adjacent to the annular ring.

According to the sliding sleeve opening tool, the cleaning element is located at the lower end of the connecting end. In accordance with the tool for opening the sliding sleeve, the engaging member comprises a tube body, the lower end of which is provided with a plurality of lower latch parts spaced circumferentially from each other, and a connector that is connected to the free end of the lower latch part.

According to the tool for opening the sliding sleeve, the engaging member is connected to the sliding sleeve in the wellbore and is provided with a rubber cylinder that can be attached to the sliding sleeve in the wellbore after expansion due to extrusion. The extrusion element is located on the outer wall of the ball socket. The extrusion element can be displaced on the engaging element and is used to extrude the rubber cylinder.

According to the tool for opening the sliding sleeve, the extrusion member comprises an annular sleeve that is movably disposed on the inner side of the engaging member and an extrusion sleeve that is compressed on the outer side of the engaging member. The annular sleeve passes through a plurality of lower latch portions of the engaging member and is connected to the extrusion sleeve. The rubber cylinder is compressed on a connector that is connected to the free end of the lower latch portion of the engaging member and abuts the lower end of the extrusion sleeve.

According to the tool for opening the sliding sleeve, the annular sleeve is connected to the engaging member via the shear pin.

According to the tool for opening the sliding sleeve, the guide groove for receiving the engaging member is located between the outer wall of the annular sleeve and the inner wall of the extrusion sleeve.

According to the tool for opening the sliding sleeve, the space is defined by the bottom end surface of the annular sleeve, the inner side of the lower flip part of the engaging member, and the end surface of the threaded end of the connector.

This disclosure has the following beneficial effects.

1. The sliding sleeve opener has a push function. The pushing tool can push the sliding sleeve opener tool at the uppermost stage near the wellhead to the bottom of the wellbore. The sliding sleeve opener at the uppermost stage may engage with an engagement member of the adjacent sliding sleeve opening tool to push the sliding sleeve opener to the adjacent stage towards the bottom of the well. The same engagement is performed between two adjacent sliding sleeve opening tools, and finally, all sliding sleeve opening tools in the wellbore can be pushed to the bottom of the well. Thus, a full bore of the tubing string for fracturing can be achieved, and the stimulation efficiency can be improved.

2. The sliding sleeve opener has a catch function. When at least two sliding sleeve opening tools are inserted into the wellbore, two adjacent sliding sleeve opening tools may be serially connected to each other to form a target. Thus, all the tools for opening the sliding sleeve can be connected in series and fully formed. In this way, sliding sleeve opening tools that form integrity through serial connections can be simultaneously fished out of the wellbore, and the efficiency of the retrieval operation can be improved.

3. The sliding sleeve opener has a push support function. The annular elastic member and the press ring form a pushing auxiliary structure, and the annular elastic member can fill the gap between the outer surface of the connecting end portion of the sliding sleeve opening tool and the inner wall of the sliding sleeve. Thus, the fluid flow in this position can be reduced, which is beneficial for pushing the tool to open the sliding sleeve axially along the borehole under the influence of external pumping pressure.

4. The sliding sleeve opener has the function of scraping off plaque. The tubular wall of the sliding sleeve in the wellbore can be cleaned with a cleaning pad.

5. The sliding sleeve opener has a sealing function. After extrusion, the rubber cylinder can be attached to a sliding sleeve in the wellbore. Thus, a seal can be achieved between the sliding sleeve opening tool and the sliding sleeve in the wellbore, and further, the possibility of hydraulic fluid flowing into the well below the sliding sleeve opening tool can be reduced. In addition, the sliding sleeve opening tool has a simple structure. The sliding sleeve opener is easy to manufacture and install, and its cost is low.

Brief Description of Drawings

The present disclosure will be explained in detail based on embodiments and with reference to the accompanying drawings. In the drawings:

FIG. 1 is a schematic diagram of the general structure of a sliding sleeve opening tool in accordance with the present disclosure;

FIG. 2a schematically shows the structure of an engaging member having a pushing function;

FIG. 2b schematically shows the structure of an engaging element having a catching function;

FIG. 3c schematically shows the structure of the guide head;

FIG. 3d schematically shows the structure of a guide head having a push head;

FIG. 3d schematically shows the structure of a guide head having a fishing head;

FIG. 4a schematically shows the structure of a ball socket;

FIG. 4b schematically shows the structure of a ball socket having an auxiliary pushing function;

FIG. 4c schematically shows the structure of a ball socket having a plaque scraping function;

FIG. 6a schematically shows the structure of a ball seat having a sealing function;

FIG. 5b schematically shows a cross-section a-a of FIG. 6a;

FIG. 6c is a schematic illustration of a ball seat structure with sealing and pushing auxiliary functions;

FIG. 6d is a schematic cross-section b-b of FIG. 6a;

FIG. 7a is a schematic illustration of the structure of a ball socket having functions of sealing, pushing and scraping off plaque; and

FIG. 7b is a schematic cross-section C-C of FIG. 7a.

In the drawings, the same components are represented by the same reference signs, and the component size does not represent the actual size of the corresponding component.

Implementation of the invention

The present disclosure will be further explained in detail with reference to the accompanying drawings.

FIG. 1 schematically shows the general structure of a sliding sleeve opening tool in accordance with the present disclosure. The present disclosure is a tool for opening a sliding sleeve. The sliding sleeve contains an engaging element 1, a ball socket 2 and a guide head 3 connected in series. The engaging element 1 comprises at least two elastic latches 11 evenly spaced in the circumferential direction and at least one engaging part 12 located on the outer peripheral surface of the elastic latch. The engaging element 1 further comprises a first fluid channel 10 that extends through the engaging element 1. The ball seat 2 comprises a second fluid channel 20 that passes through the ball seat 2, and the sealing ball bearing surface 21 is located within the second fluid channel 20 Wednesday. The second fluid channel 20 communicates with the first fluid channel 10. The guide head 3 comprises a third fluid channel 30 that extends through the guide head 3 and the third fluid channel 30 communicates with the second fluid channel 20.

It is preferable that the engaging element 1 comprises four elastic catches 11, and the engaging part 12 comprises at least one protrusion. In this case, a plurality of projections are located on the circumferential surface of the elastic latch 11, this plurality of projections are located along the extension direction of the elastic latch with a distance between them. A groove for engaging the shoulder is located on the inner wall of the sliding sleeve (not shown in FIG. 1). Two protrusions located at at least one end are provided with a guide surface close to the top of the elastic latch 11 and a guide surface close to the bottom of the elastic latch 11. The groove on the sliding sleeve has an inclined surface for engaging with the guide surface. The protrusion provided with a guide surface can smoothly enter and exit the groove located on the sliding sleeve.

When the sliding sleeve opener is lowered into the borehole, the elastic latch 11 is radially compressed due to the radial force applied by the borehole wall, so that the sliding sleeve opener can be lowered smoothly. When the sliding sleeve opening tool is lowered to the position of the suitable sliding sleeve, the radial force applied to the elastic latch 11 disappears, and thus the elastic latch 11 can expand to its original state. In addition, the projection on the elastic latch 11 can be included in a groove on the sliding sleeve. At this time, the sliding sleeve opener is ready to open the sliding sleeve. When the tool to open the sliding sleeve is to be fished out, a radial force is applied to the elastic latch 11 to cause the elastic latch 11 to radially shrink and deform, and then the protrusion located on the elastic latch 11 is separated from the groove on the sliding sleeve and finally exits engagement with a sliding clutch. At this time, you can fish out a tool to open the sliding sleeve.

FIG. 2a schematically shows the structure of an engaging member having a pushing function. It is preferable that the guiding ramp 13 is located on the outer peripheral surface of the end of the engaging member 1 away from the ball seat 2. That is, the guiding ramp 13 is located on the outer peripheral surface of the free end of the elastic latch 11. Thus, at the free end of the elastic latch 11, an oblique the surface facing the outside and the inclined surface can serve for guidance and adhesion. When the upper stage sliding sleeve opener is pushed to perform the catching operation, the effective surface located on the guide head 3 can engage with the guide ramp 13 at the free end of the elastic latch 11 of the lower stage sliding sleeve opener. The multi-structured deformations of the guide head 3 will be described in detail below.

FIG. 2b schematically shows the structure of an engaging element having a catching function. Preferably, the protrusion or groove is additionally located on the outer peripheral surface of the elastic latch 11. FIG. 2b shows the groove 14. When the catching operation is performed, the locking tooth of the tool for opening the sliding sleeve in the upper stage can be included in the groove of this tool for opening the sliding sleeve. in the lower stage to realize an engaging connection. Therefore, the engaging connection between the sliding sleeve opening tool in the upper stage and the sliding sleeve opening tool in the lower stage is stable and reliable in the fishing process.

FIG. 3a schematically shows the structure of the guide head. The directional ramp 31 is located on the outer peripheral surface of the end of the guide head 3, away from the ball seat 2. The guide ramp 31 can effectively guide the sliding sleeve opening tool to move downward so as to reduce the pulling resistance of the sliding sleeve opening tool.

FIG. 3b schematically shows the structure of a guide head having a push head. The third fluid channel 30 includes a pushing end 32, which is a tapered bore section and located at the end of the guide head 3, and the large opening end of the pushing end 32 is away from the ball seat 2. The pushing end 32 can guide the elastic latch 11 of the tool to opening the sliding sleeve at a lower stage to engage the pushing end 32 to cause the elastic latch 11 to disengage from the sliding sleeve. Thus, the pushing end 32 can push the sliding sleeve opener in the lower stage to move towards the bottom of the well.

It is preferable that the inner diameter of the large opening end of the pushing end 32 is less than the outer diameter of the guide head 3. The end surface 33 is formed between the outer peripheral surface of the guide head 3 and the wall of the opening of the pushing end 32, and a longitudinal section of the end surface 33 along the axial direction of the pushing end 32 has circular arc shape. That is, the rounded corner structure is disposed between the pushing end end surface 33 and the outer circumferential surface of the pushing end 32 and between the pushing end end face 32 and the wall of the pushing end hole 32. The pushing end end 32 in the shape of a circular arc can more easily enter the gap between the guide ramp 13 of the elastic latch 11 of the sliding sleeve opening tool and the inner wall of the sliding sleeve, which makes the elastic latch 11 disengaging with the sliding sleeve, so that the pushing operation can be performed smoothly.

FIG. 3c is a schematic diagram showing the structure of a guide head having a catch head. An annular groove 34 that extends along the circumferential direction of the third fluid passage 30 is located on the inner wall of the third fluid passage 30. When the end of the elastic latch 11 of the sliding sleeve tool in the lower step extends into the third fluid channel 30 and the position of the engaging structure 15 (as shown in Fig.2b) corresponds to the position of the annular groove 34, the end of the elastic latch 11 will expand radially under the action of the elastic restoring strength. In addition, the engaging structure 15 will engage in the annular groove 34 so that an engaging connection is formed between the sliding sleeve opening tool in the upper stage and the sliding sleeve opening tool in the lower stage, which ensures stability and reliability of the engagement between the sliding sleeve opening tool in the upper stage and a tool to open the sliding sleeve in the lower stage during the catching process.

FIG. 4a schematically shows the structure of a ball socket. The retaining portion 16 (as shown in FIG. 1) is located on the inner wall of the first fluid passage 10 close to the ball seat 2, and the sealing ball 22 abutment surface 21 is located in the second fluid passage 20. The retaining part 16 and the bearing surface 21 together with the second fluid passage 20 form a ball cage, and the sealing ball 22 is located in the ball box. In this way, the sealing ball 22 can be lowered into the wellbore with the sliding sleeve opening tool, and there is no need to throw the ball into the borehole head. When the sealing ball 22 freely moves in the ball box, it is limited by the retaining portion 16 so that the sealing ball 22 cannot escape from the ball box. When the sliding sleeve opener is lowered to a predetermined position, external pumping pressure can be applied directly to the slide opener, which can shorten the stimulation time. After applying the external pumping pressure, the sealing ball 22 abuts against the bearing surface 21 to form a sealing surface, and thus the sliding sleeve opening operation is completed.

FIG. 4b schematically shows the structure of a ball socket having a pushing assist function. Preferably, the ball seat 2 comprises a connecting end portion 23 that is connected to the engaging member 1, and an annular elastic member 24 and a press ring 25 that abuts the annular elastic member 24 are located on the connecting end portion 23. The shoulder is located at the end the connecting end part 23, and the annular elastic member 24 is compressed at the connecting end part 23. Then the press ring 25 is compressed at the connecting end part 23 and abuts the annular elastic member 24. Finally, the connecting end part 23 is connected to the lower end of the engaging member 1 through a thread ... The lower end surface of the engaging member 1 and the shoulder surface of the connecting end portion 23 together fix the pressing ring 25 and the annular elastic member 24. 24. The annular elastic member 24 and the press ring 25 may form a push assist structure. It is assumed that only one annular elastic member 24 is located between the lower end surface of the engaging member 1 and the shoulder surface of the connecting end portion 23. The annular elastic member 24 can fill the gap between the outer peripheral connection surface of the end portion 23 of the sliding sleeve opening tool and the inner wall of the sliding sleeve so that the flow of fluid in this position is reduced, which is useful for pushing the sliding sleeve opener to move axially along the wellbore by external pressure.

FIG. 4c schematically shows the structure of a ball socket having a plaque scraping function. Preferably, the cleaning element 26 is disposed at the lower end of the connecting end portion 23 so that the wall of the sliding sleeve pipe in the wellbore can be cleaned. The position of the cleaning element 26 is the same as the position of the annular elastic element 24 and the pressing ring 25 in Fig. 4b, and its details will not be repeated here.

FIG. 6a schematically shows the structure of a ball seat having a sealing function, and FIG. 5b schematically shows a cross-section a-a of FIG. 6a. Preferably, the engaging member 1 engages with the sliding sleeve in the wellbore, and a rubber cylinder 27 is installed which can be attached to the sliding sleeve in the wellbore after expansion due to extrusion. The extrusion member 28 is disposed on the outer wall of the ball socket 2, and the extrusion member 28 is displaceable on the engaging member 1 for extrusion of the rubber cylinder 27. The rubber cylinder 27 may expand after extrusion to be attached to a sliding sleeve in the wellbore. Thus, a seal can be achieved between the sliding sleeve opening tool and the sliding sleeve in the wellbore, and furthermore, the possibility that hydraulic fluid has flowed into the well below the sliding sleeve opening tool can be reduced.

In particular, as shown in FIG. 5b, the extrusion element 28 contains an annular sleeve 281, which is movable from the inner side of the engaging element 1 and the extrusion sleeve 282, which is compressed on the outer side of the engaging element 1. The engaging element 1 contains a pipe, the lower end (end opposite to the wellhead) which is provided with a plurality of lower latch parts 17, which are arranged in a circle with a distance between them, and a connector 18 connected to the free end of the lower engaging part 17. An annular sleeve 281 passes through a plurality of lower latch parts 17 and is connected to an extrusion sleeve 282. Rubber cylinder 27 is compressed on the connector 18 and abuts the lower end of the extrusion sleeve 282. The rubber cylinder 27 is located between the protrusion of the connector 18 and the extrusion sleeve 282. In addition, the extrusion member 28 can be made in one piece. In addition, the annular sleeve 281 can be connected to the engaging member 1 via the shear pin 4, so that the annular sleeve 281 can be secured to the engaging member 1.

Preferably, the guide groove 283 for receiving the engaging member is located between the outer wall of the annular sleeve and the inner wall of the extrusion sleeve. The extrusion element 28 can be guided through the engaging element 1, and the impacts during movement of the extrusion element 28 due to the relatively high elasticity of the lower latch portions 17 can be reduced. Preferably, the space 29 is defined by the lower end surface of the annular sleeve 281, the inner side of the lower parts of the latch 17 of the engaging element 1 and the end surface of the threaded connector 18, and the space 29 provides a buffer space for compression of the rubber cylinder 27. The position of the lower end surface of the ring sleeve 281 is limited by the end the surface of the connector 18 is threaded and, in addition, the position of the extrusion element 28 is limited. In this way, more damage to the rubber cylinder 27 due to excessive movements of the extrusion member 28 can be avoided. In a particular application, the lateral force of the shear pin for fixing the inner sleeve to the outer body of the sliding sleeve is set to be greater than the lateral force of the shear pin 4 for fixing the extrusion member. 28 on the engaging element 1. When it is necessary to open the circulation channel, the pressure of the corresponding pipe section is held. When the pressure reaches a certain value, the shear pin 4 of the collar 281 breaks. Then, the collar 281 is pushed downwardly and thus the extrusion member 28 is moved downwardly so that the rubber cylinder 27 is extruded. After the rubber cylinder 27 is extruded to a certain extent, the pressure is continuously increased. Once the pressure is increased to a certain value, the shear pin to secure the inner sleeve in the wellbore will collapse and the inner sleeve in the wellbore will move downward to open the circulation path. After the completion of the above process, a deposit stimulation operation and subsequent work can be carried out. Alternatively, the lateral force of the shear pin for securing the inner sleeve of the sliding sleeve in the wellbore can also be made less than the lateral force of the shear pin 4 of the extrusion member 28.

FIG. 6a schematically shows the structure of a ball seat with auxiliary sealing and pushing functions, and FIG. 6b is a schematic cross-section b-b of FIG. 6a. This embodiment is similar to the embodiment shown in FIG. 5a and 5b, and the only difference is that the annular elastic member 24 and the press ring 25, which is adjacent to the annular elastic member 24, are additionally located on the connecting end portion 23.

FIG. 7a schematically shows the structure of a ball seat with sealing, pushing and scraping functions, and FIG. 7b shows a schematic cross-sectional view C-C of FIG. 7a. This embodiment is similar to the embodiment shown in FIG. 5a and 5b, and the only difference is that the cleaning element 26 is additionally disposed on the connecting end portion 23 to clean the sliding sleeve pipe wall in the wellbore.

To summarize, this disclosure mainly has the following beneficial effects.

1. The sliding sleeve opener has a push function. The pushing tool can push the tool to open the sliding sleeve at the uppermost stage close to the head of the well towards the bottom of the well. The sliding sleeve opener at the uppermost stage may engage with an engagement member of the adjacent sliding sleeve opener to push the sliding sleeve opener to the adjacent stage towards the bottom of the well. The same engagement is performed between two adjacent sliding sleeve opening tools, and finally all of the sliding sleeve opening tools in the wellbore can be moved to the bottom of the well. Thus, a full bore of the fracturing tubing can be achieved, and the stimulation efficiency can be improved.

2. The sliding sleeve opener has a catch function. When at least two sliding sleeve opening tools are inserted into the wellbore, two adjacent sliding sleeve opening tools may be serially connected to each other to form a target. Thus, all the tools for opening the sliding sleeve can be connected in series and fully formed. In this way, sliding sleeve opening tools that form integrity through serial connections can be simultaneously fished out of the wellbore, and the efficiency of the fetch operation can be improved.

3. The sliding sleeve opener has a pushing assist function. The annular elastic member and the press ring form a pushing auxiliary structure, and the annular elastic member can fill the gap between the outer surface of the connecting end portion of the sliding sleeve opening tool and the inner wall of the sliding sleeve. Thus, the flow of fluid in this position can be reduced, which is beneficial for pushing the tool to open the sliding sleeve axially along the wellbore under the influence of external pumping pressure.

4. The sliding sleeve opener has the function of scraping off plaque. The tube wall of the sliding sleeve in the wellbore can be cleaned with a cleaning pad.

5. The sliding sleeve opener has a sealing function. After extrusion, the rubber cylinder can be attached to a sliding sleeve in the wellbore. Thus, a seal can be achieved between the sliding sleeve opening tool and the sliding sleeve in the wellbore, and further, the possibility of hydraulic fluid flowing into the well below the sliding sleeve opening tool can be reduced. In addition, the sliding sleeve opening tool has a simple structure. It is easy to manufacture and install, and the cost is low.

The present disclosure has been illustrated in detail in conjunction with the preferred embodiments described above, but it will be understood that the embodiments disclosed herein may be improved or replaced with equivalents without departing from the protection scope of the present disclosure. In particular, as long as there are no structural conflicts, the specifications disclosed in each embodiment of the present disclosure may be combined with each other in some way, and the combined functions thus formed are within the protection of the present disclosure. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (20)

1. A tool for opening a sliding sleeve containing an engaging element, a ball socket and a guide head connected in series, in which the engaging element comprises at least two elastic latches evenly spaced in a circular direction and at least one engaging part located on the outer peripheral surface of the elastic latch, and the engaging element is further provided with a first fluid channel that passes through the engaging element ; wherein the ball seat is provided with a second fluid passage that extends through the ball seat, and a sealing ball abutment surface is located within the second fluid passage, the second fluid passage in communication with the first fluid passage; and in which the guide head is provided with a third fluid channel that passes through the guide head, and the third fluid channel communicates with the second fluid channel; and in which the protrusion or groove is located on the outer peripheral surface of the elastic latch. 2. The sliding sleeve opening tool of claim 1, wherein the guide ramp is located on an outer peripheral surface of an end of the engaging member away from the ball seat. 3. The sliding sleeve opening tool of claim 1, wherein the guide ramp is located on an outer peripheral surface of the end of the guide head away from the ball seat. 4. The sliding sleeve opening tool of claim 1, wherein the third fluid passage comprises a tapered bore section located at an end of the guide end and a large open end of the tapered bore section away from the ball seat. 5. The sliding sleeve opening tool of claim 4, wherein the inner diameter of the large opening of the tapered bore section is smaller than the outer diameter of the guide head and the end surface is formed between the outer circumferential surface of the guide head and the bore wall of the tapered bore section, the longitudinal the end surface section along the axial direction of the tapered hole section has the shape of a circular arc. 6. The sliding sleeve opening tool of claim 4, wherein an annular groove that extends circumferentially along the third fluid channel is located on an inner wall of the third fluid channel. 7. The tool for opening the sliding sleeve according to claim 4, wherein the retaining part is located on the inner wall of the first fluid channel close to the ball seat, the retaining part and the abutment surface together with the second fluid channel form a ball box, and the sealing ball is located in the ball box. 8. The sliding sleeve opening tool of claim 1, wherein the ball socket has a connecting end portion that is connected to the engaging member and an annular elastic member is disposed on the connecting end portion. 9. The tool for opening the sliding sleeve according to claim 8, further comprising a press ring that abuts the annular ring. 10. The sliding sleeve opening tool of claim 8, wherein the cleaning element is located at the lower end of the connecting end portion. 11. The tool for opening the sliding sleeve according to claim 1, wherein the engaging member is connected to the sliding sleeve in the wellbore and is provided with a rubber cylinder that can be attached to the sliding sleeve in the wellbore after expansion due to extrusion, and the extrusion member is located on the outer wall of the ball socket, the extrusion element being movable on the engaging element and used to extrude the rubber cylinder. 12. The tool for opening the sliding sleeve according to claim 1, wherein the extrusion member comprises an annular sleeve that is movably disposed on the inner side of the engaging member and an extrusion sleeve that is compressed on the outer side of the engaging member, the annular sleeve extending through a plurality of lower portions latch and coupled to the extrusion sleeve, and in which the rubber cylinder is compressed on a connector that is connected to the free end of the lower latch portion of the engaging member and abuts the lower end of the extrusion sleeve. 13. The tool for opening the sliding sleeve according to claim 12, wherein the engaging element comprises a tube body, the lower end of which is provided with a plurality of lower latch parts spaced circumferentially with a distance between them, the annular sleeve extending through the plurality of lower latch parts and connected to the extrusion sleeve, and a rubber cylinder is located between the connector and the extrusion sleeve. 14. The sliding sleeve opener of claim 12, wherein the annular sleeve is coupled to the engaging member via a shear pin. 15. The tool for opening the sliding sleeve according to claim 12, wherein a guide groove for receiving the engaging member is located between an outer wall of the annular sleeve and an inner wall of the extrusion sleeve. 16. The sliding sleeve opener of claim 12, wherein the space is defined by a lower end face of the annular sleeve, an inner side of the lower latch portion of the engaging member, and an end face of a threaded connector end.

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